Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Sigma SA

Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Sigma SA

Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Sigma SA

B&H # EMBL1215SI8S
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Expected availability: 7-14 business days

Product Highlights

  • SA-Mount Lens/APS-C Format
  • 25.5-75mm (35mm Equivalent)
  • Aperture Range: f/2.8 to f/22
  • Two FLD Elements
  • Three Aspherical Elements
  • Super Multi-Layer Coating
  • Hyper Sonic Motor AF System
  • OS Image Stabilization
  • Rounded 7-Blade Diaphragm
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Price: $669.00

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  • 1Description

Characterized by its versatile zoom range and bright design, the Sigma SA-mount 17-50mm f/2.8 EX DC OS HSM from Sigma covers a wide-angle to portrait-length range and features a constant f/2.8 maximum aperture to excel in available light conditions. The optical design incorporates a pair of low dispersion elements along with a trio of aspherical elements to reduce a variety of aberrations and promote greater sharpness and clarity. A Super Multi-Layer Coating is also used to suppress flare and ghosting for improved contrast and color accuracy. Benefitting the optics, a Hyper Sonic Motor affords quick and quiet autofocus performance while an Optical Stabilizer minimizes the appearance of camera shake for sharper handheld shooting. Additionally, the lens is distinguished by its sleek profile, making it an ideal lens for walkaround and travel shooting.

Standard zoom lens is designed for APS-C-format Sigma SA-mount cameras and provides a 25.5-75mm equivalent focal length range.
Constant f/2.8 maximum aperture is well-suited for working in low-light conditions and also provides greater control over the focus position when using shallow depth of field techniques.
Two F Low Dispersion (FLD) elements are featured in the optical design, and help to reduce color fringing and chromatic aberrations for improved clarity and color accuracy.
Three aspherical elements are used to help limit distortion and spherical aberrations and also contribute to greater overall sharpness and accurate rendering.
Super Multi-Layer Coating has been applied to individual elements to minimize flare and ghosting for improved contrast and color accuracy when working in strong lighting conditions.
Hyper Sonic Motor (HSM), along with an internal focusing design, realizes quick and quiet autofocus performance as well as full-time manual focus override.
Minimum focusing distance of 11" and a 1:5 maximum magnification ratio benefits working with close-up subjects.
Optical Stabilizer system minimizes the appearance of camera shake to benefit making sharper imagery when shooting handheld.
Rounded seven-blade diaphragm contributes to a pleasing bokeh quality.
In the Box
Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Sigma SA
  • LCF-77 III 77mm Lens Cap
  • Rear Cap LCR II for Sigma Mount Lenses
  • Lens Hood for 24mm f/1.8 EX Digital, 17-50 f/2.8 EX, 28mm f/1.8 EX Lens
  • Lens Case
  • Limited 1-Year Warranty
  • Limited 3-Year U.S.A. Warranty Extension
  • Table of Contents
    • 1Description
    Focal Length 17 to 50mm
    Comparable 35mm Focal Length: 25.5 to 75 mm
    Aperture Maximum: f/2.8
    Minimum: f/22
    Camera Mount Type Sigma SA
    Format Compatibility APS-C
    Angle of View 79.7° to 31.7°
    Minimum Focus Distance 11.02" / 28 cm
    Magnification 0.2x
    Maximum Reproduction Ratio 1:5
    Optical Design 17 Elements in 13 Groups
    Diaphragm Blades 7, Rounded
    Image Stabilization Yes
    Autofocus Yes
    Filter Thread Front: 77 mm
    Dimensions (DxL) 3.29 x 3.61" / 83.5 x 91.8 mm
    Weight 1.24 lb / 565 g
    Packaging Infoxufeuvcexsaxyeufbwtutucbxwuvztcqcstt
    Package Weight 1.85 lb
    17-50mm f/2.8 EX DC OS HSM Zoom Lens for Sigma DSLRs with APS-C Sensors is rated 3.0 out of 5 by 2.
    Rated 2 out of 5 by from Not one of Sigma's best efforts I bought this lens in hope that I would be able to handhold it at 50mm f4 at 1/25 sec. For me to be able to do this two things were necessary:1. it needed to be sharp at f4 from center to corner and2. the OS had to work well at 1/25 sec.To my great surprise it was actually sharp enough to use at f2.8. But on trying to use the OS I discovered that either it was broken out of the box or the worse designed lens stabilization system ever invented. I'll assume the former for this review because I can't imagine any company, even one as well known as Sigma for cutting corners, that would actually release a design this bad. The OS actually would occasionally work at 1/8, 1/13/, 1/15 and 1/20 sec., but not at any other speed (go figure). At any faster speeds the OS would actually lower the sharpness of the image (one shot I did at 1/640 sec was so bad it looked as if someone shook the camera). So the OS was actually interferring with the sharpness of the lens at higher shutter speeds, which is why I assume I got a lemon.The other thing I wasn't too happy about this lens was that only at 50mm were the corners sharp. At all the other focal lengths the corners didn't become usuable until f11, and by f11 defraction lowers the sharpness in the center.So you can see why I cannot really recommend this lens to anyone. Even if the OS did work correctly the poor corner performance would still render it unacceptable. Only at 50mm is it really any good center to corner.For those who are interested I posted my complete test at infinity here:
    Date published: 2012-03-14
    Rated 4 out of 5 by from Better then expected Don't like to do this. But - here goes after one day of use - yes one day. The funny thing I had convinced myself before the lens got here that I was going to not like it. I have the 30mm Sigma Art lens that's the lens I use for Infrared - this lens isn't as sharp as the 30mm but has more contrast when it comes to Infrared which is the whole point of B&W Infrared. I can turn the sky black with zone 7-10 white clouds with this lens - can't do that with the prime. I was on the fence but super happy with this lens. It works very well with Infrared - has the gold Nikon thing going don't know what that's about. However the zoom and focus were tight at first then the focus became lose enough to use your little finger to focus - the zoom ring can be locked - otherwise it zooms just a little jerky 4 stars. Other then the zoom what's not to love I'm 64 and carried this around all day with no problem.
    Date published: 2018-08-11
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